Stock beater



1,624, 7 Apnl 12 1927" c. w. sHAR'rLE 8 5 STOCK BEATER Filed- Sept. 4, 1923 razenee'd Apr.' 12, 1927.

PATENTA pence.

' camas w. sminrnn, or l'u'nnnnrown, omo.

srocx Baarn-n.

. application mea sepeember 4,1m. serial ne. seam.

This .invention `relates to, improvements in stock beaters for making paper pulp, having particular reference to a type of beater in which the process of reduction is continuous.

In a composite aper stock the raw stock contains, in variable percentages, two general grades of material, nonfibrous material, as old paper stock, and fibrous material, as fabrics of all sorts. The non-fibrous f material reduces more rapidly than the fibrous material, which resulted, under the old ractice of kee ing all the stock in reduction the same ength of time, in over reduction of the non-fibrous material and, accordingly, in imparing the quality of the finished product.

In more recentyears the most approved practice is to separate the line material from the coarse continuously, as the desired state of reduction of the line material is arrived at, while reduction is in progress, which serves to prevent over'reduction of the nonibrous material, and also lends itself readily without added manufacturing cost :to producing' two grades of pulp, first grade fibrous pulp for making the finer grades of paper and second grade noniibrous pulp for making the common grades of aper.

arious forms .of reduction apparatus consisting of two or more units, as a stock breaker and finishing beater, or stock breaker, settling trough and finishing beater, or stock breaker, settling trough, screen and finishing beater, etc., arranged in coordinated relations forcontinuous production of pupl are now in use.

. e' improvements of the present invention relate to a stock beater, or beater engine, in which all the functions for producing pulp by continuous operation are com-- bined 1n a single unit, thus simplifying both the apparatus and the process of reduction and, accordingly, effecting substantial economies in production costs.

'in the accompanying drawings:

Fig 1, is a plan view illustrating a .beater engine of the improved construction;

' ments.

l Fig.2, is a broken sectional view taken on a line 2 2 of Fig 1;

Fi 3, is a cross sectional View taken on a line 3 3 of Fig. 1;

Fig. 4, is a detail vertical sectional view taken on a line 4-4 of Fig. 1.

As here shown the reduction apparatus consists of a beater tub-1, a beater rOll 2, supported on a drive shaft 3 and provided with blades or knives 4, arranged in the usual manner. Drive shaft 3 is 60 supported-on opposite sides of .the tub in suitable brackets 5, and is adapted to be driven by a belt or pulley 6, the usual provision being made for raisin and Vlowering the beater roll relative to te bed plate a5 7 by means of a worm gear arrangement 8. These features in various modified' forms of construction are more or less common in beater construction and no vnovelty is claimed in respect thereto in connection with the present invention The beater tub is further provided at its opposite ends with weirs 9, and with a mid-feather 10, .extending longitudinally through the center of the tub, water being supplied to the tub through a pipe 11. These features are also common in beater construction except as to the modications which are features of the present improve- The improvements consist in a series of apertures` 12, formed in the wall of the beater tub adjacent each Weir 9, and apertures 13, formed in like manner in one of the walls of the mid-feather, which as here a5 shown comprises two opposite' walls 10, having a space 14, therebetween. Further improvements consist in a double series of apertures 15, and a plurality of slots 16, formed in the bottom 'of the tub, and a 9o back-fall 17, in the usual relation to the beater roll. Secured to the bottom' of the tub opposite each series of apertures 15 -is acatch pan 18, and opposite each slot provided with a valve 23, each of the weirs 9 being provided in like manner with a drain pipe 24, provided with a valve 25.

From the foregoing detailed description of the construction of the improved beater the following explanation of the operations of reduction will be readily understood;

Raw stock is supplied to the beater tub by any suitable means` as an overhead chute or conveyor. water to mix with the stock in the desired fliiantity being supplied through pipe 11. he stock is kept in motion in the tub, by the action thereon ot' the beater roll, the stock flowing around the .midfeather and passing between the beater roll and the bed plate and over the back-fall, which gives it added momentum, continuously until the required state of reduction is arrived at.

Portions of the stock, as old paper and light fabrics having a low percentage of fibrous material, will be reduced to the required state by the hydration ot' t-he stock andthe action thereon of the beater roll, in much shorter time than other' portions of the stock, as the heavier fabrics of all kinds, having a. high percentage of fibrous material. 1t is desirable to remove the fine stock from the mass in process of reduction continuously as the required state of yfineness is arrived at, to prevent over reduction of any part, of the stock. Toithis end the a ertures 12, and 13, are provided to cause the tine stock to separate from the coarse, and to pass through the apertures into weirs 9, and the space 14, 0f the mid-feather.

The fine stock entering the midfeather chamber rises to the same level as the stock in the tub and returns to the apertures 13 at the higher levels, due to the constant agitation and movement of the stock, to the pulp mass Heating in the tub, the perforated wall of the midfeather acting as a screen for grading the stock. The fine stock entering the chambers 9 overflows the rim of the weirs and is conducted to any suitable apparatus, as a pump, for conveying the tinished stock to other units of the reduction apparatus, as a stuft chest or thickener. As in the case of the perforated midfeather wall. the perforated end walls of the beater tub also act as screens for grading the stock, the arrangement as a whole being in effect a reduction apparatus adapted for continuous operation in which the finished stock isI separated from the mass without interrupt-- ing the reduction process on the unfinished portions of the stock, the arrangement being also effective to prevent over reduction of the finished stockn The coarse material remaining in the tub will be in further reduction until it is brought to the required state of fineness to pass from the tub through the grading apertures, additional raw stock being'supplied as required to keep the supply in the tub 'at normal.

Heavy substances foreign to pulp material, as sand, fragments of rock and glass, pieces ot' metal. etc., will gravit-ate to the bottom ot' the tub, coarse substances passing through the slots 16, into catch pans 19, and fine materials passing through the slots 16,

and also through apertures 15, into catch` pans 18. The deposits in pans 18, and 19, can be removed therefrom through suitable valves 20, and 21.

Having described my invention, I claim:

1. A continuous beater including in combination with. a tub for mixing the raw stock in water, a beater roll operable inthe tub for reducing the stock, a mid-feather comprising opposite walls forming a receptacle, and lari-outward extension of the tub forming a receptacle, apertures opening from the tulrinto said receptacles, whereby portions of the material reduced to a given state and oating at vvarious levels will separate from the mass of the material in the tub and pass through said apertures into said receptacles:

2. A continuous beater including in cornbination with a tub for mixing the raw stock in water, a beater roll operable in the tub for reducing the stock, a series of apertures formed in the wall of said tubi along the course of the fiow of thestock therein, and apertures formed in the bottom of the tub, whereby portions of the material reduced to a given state will separate from the mass of material in the tub and gravitate through the aperturesI in said wall and heavy substances 'foreign to pulp material will gravitate through the apertures in the bottom of the tub.

A continuous reduction apparatus comprising a beater tub, a beater roll operable in the tub, a weiradjaeent the tub adapted to overflow with stock received from the tub` and a perforated wall between the tub and we'ir acting to grade the stock passing from the tub t0 the Weir.

4. A continuous reduction apparatus comprising a beater tub, a beater roll operable in the tub, a chambered portion arranged relative to the tub adapted tov overflow with stock received from the tub, and a perforated wall between said chambered portion and the stock under course of reduction in the tub acting to grade the stock passing to said chamber.

5, A continuous reduction apparatus comprising a beater tub, a beater roll operable inthc. tub, achambered portion arranged relative to the tub adapted to receive stock continuously from the tub and to overow with stock so received, and a perforated Wall' between said chambered portion and the rae stock received from the tub and to prevent.

further reduction thereof and an element interposed between said chamber and the 10 stock under course of reduction in the tub acting to grade the stock passing to said chamben In testimony whereof, I aix my signature.

CHARLES W. SHARTLE. 

